X-ray flare from a dim source.Last Dec. 15, the Chandra X-ray Observatory stared at an old, failed star failed star: see brown dwarf. for 9 hours and saw absolutely nothing. That's just what Gibor Basri of the University of California, Berkeley was hoping. The absence of radiation confirms that as failed stars, known as brown dwarfs Dwarfs Fannie Mae issued mortgage-backed securities pools that have an original maturity of 15 years., grow older, they lose their hot outer atmosphere, or corona, and can't readily generate X-ray flares, he says. But there appears to be some life left in these fading objects, which lack the mass to burn steadily as bona fide bona fide adj. Latin for "good faith," it signifies honesty, the "real thing" and, in the case of a party claiming title as "bona fide" purchaser or holder, it indicates innocence or lack of knowledge of any fact that would cast doubt on the right to hold title. stars. Nine hours into the 12-hour observation of the aging brown dwarf brown dwarf, in astronomy, celestial body that is larger than a planet but does not have sufficient mass to convert hydrogen into helium via nuclear fusion as stars do. Also called "failed stars," brown dwarfs form in the same way as true stars (by the contraction of a swirling cloud of interstellar matter). True stars have enough mass (greater than 0. LP 944-20, an X-ray flare smacked the telescope. Jolted by the result, Basri says the lone flare indicates that although older brown dwarfs don't have a corona, they do have magnetic fields that can occasionally generate storms beneath the surface of the failed star. These flares sometimes punch through into the cool atmosphere of the dwarf. Basri and his colleagues are scheduled to report their findings in an upcoming ASTROPHYSICAL JOURNAL LETTERS. |
|
||||||||||||||||||||||
Printer friendly
Cite/link
Email
Feedback
Reader Opinion